Selected MCQ

Current Question
Which constant relates energy and frequency?
  • A. Boltzmann constant
  • B. Planck constant
  • C. Avogadro number
  • D. Gas constant
Correct Answer: B
Explanation:
(E = h\nu).
Related Question 1
Which constant defines thermal energy scale?
  • A. Planck constant
  • B. Boltzmann constant
  • C. Avogadro number
  • D. Gas constant
Correct Answer: B
Explanation:
(k_B) relates temperature to energy.
Related Question 2
In thermodynamics, the Helmholtz free energy is minimized at constant:
  • A. Pressure and temperature
  • B. Volume and temperature
  • C. Volume and entropy
  • D. Pressure and entropy
Correct Answer: B
Explanation:
Helmholtz free energy applies to constant T and V systems.
Related Question 3
Which energy source is sustainable?
  • A. Coal
  • B. Oil
  • C. Solar
  • D. Gas
Correct Answer: C
Explanation:
Solar is sustainable.
Related Question 4
Which energy is motion?
  • A. Potential
  • B. Thermal
  • C. Kinetic
  • D. Chemical
Correct Answer: C
Explanation:
Motion defines kinetic energy.
Related Question 5
Which unit measures frequency?
  • A. Joule
  • B. Watt
  • C. Hertz
  • D. Pascal
Correct Answer: C
Explanation:
Hertz = cycles per second.